Sad-iron.



G. T. hosENGREN.

SAD IRON.

APPLICATION FILED JUNE I9. i915.

I 1,205,265.` rammed Nov. 21, 1916.

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PATENT @FFIQE GEORGE T. ROSENGREN, 0F CHICAGO, ILLINOIS, ASSIGNR T) ENTERPRISE TOOL AND METAL WORKS, 0F CHICAGC, ILLINOIS, A CORPGRATION OF ILLINOIS.

SAD-IRON.

Leonesa.

Application filed June 19, 1915.

To all whom t may concern Be it known that I, GEORGE T. RosENGRnN, a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Sad-Irons, of which the following is a full, clear, and exact description.

The invention relates to gas burners and the object of the invention is to provide an improved construction of gas burners adapted for sad irons, by which backfiring at the air inlets will be prevented.

The invention consists in the several novel features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings: Figure 1 is a perspective of a sad iron embodying the invention. Fig. 2 is an enlarged section of the burner pipe with the mixing device therein. Fig. 3 is a perspective of the mixing plug in the burner pipe.

The invention is shown as applied to a sad iron comprising a body 15 having a combustion chamber therein, a cover 17 secured to the top of the body, a suitable handle 18 secured to the cover, and a burner pipe 19 extending into the combustion chamber and suitably secured in the body 15 of the iron.

A flexible .pipe 29 for supplying gas to the burner-pipe is connected to the nipple 30. AV valve casing 31 through which gas will flow under control of a valve 32 of suitable construction, is provided with a jet 33 through which gas will be discharged into the rear or upper end of the burner-pipe 19. Valve-casing 31 extends into the burner-pipe and is secured therein by screws 34. The lower end of valve-casing 31 is tapered or conoidal, as at 35 and air-inlets 36 are formed in the burner-pipe adjacent this conoidal portion of the casing. In passing from the jet 33, the gas commingles with the air entering the burner-pipe through inlets 36 and is directed by a flared opening 39 at the upper end of said plug into a central duct 37 formed ina plug 38. The latter is rigidly secured in the burner-pipe, being usually brazed therein. In practice, it is desirable to effect a further mixture of the fluid and air and diiiiculty has been experienced in effecting this second mixture in such manner that the burner would not frequently back-fire. To overcome this 'diniculty, plug 38 is tapered or reduced on its Specification of Letters Patent.

patented Nov. 21, 1916.

serial No. 34,977.

outside, as at 40, opposite air-inlets 41. Below this portion 40, the plug is provided with a cylindrical portion 42, fitting in the tube 19 and oblique holes 43 pass through the plug to direct air entering through the inlets 41 into the enlarged lower terminal 44 of the central duct 37. A iange 37a is formed below the inner ends of ducts 43 and central opening 37, leaving an annular channel for circulation of air from ducts 43. As a result, air will be drawn into the burner pipe through holes 43 in such direction that it will be thoroughly mixed with the fluid passing through duct 37 and the second 1nixture of air will be effected in such manner that back-firing will be avoided. In practice it has been found that if air entering the inlets 41 is directed longitudinally of the burner-tube before being thoroughly mixed with fluid from duct 37, a body of air surrounding the fluid will tend to remain in and adjacent the wall of the tube and this causes back-firing. The invention provides simple and eiicient means for effecting thorough mixture of air passing into the tube through the second inlet and the gas which has been mixed with air from the first inlet, so that the burner will be efiicient and so that back-firing will be avoided.

The invention is not to be understood as restricted to the details set forth, since these may be modified within the scope of the appended claims, without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is:

1. The combination with a burner-pipe, of a gas jet, the pipe being provided with an air-inlet and a plug fitting in the pipe, having a central duct into which gas from the jet and air fromv said inlet will be directed, the burner-pipe lbeing provided with a second inlet around the plug, the latter having a portion fitting in saidpipe and a duct in said portion leading inwardly from the second inlet and to direct air from the second inlet into the path of mixed air and gas from the central duct.

2. The combination with a burner-pipe, of a gas jet, the pipe being provided with an air-inlet adjacent the jet, and a plug in the pipe having a central duct into which gas from the jet and air from said inlet will be directed, the burner-pipe being provided with a second inlet aroundv the plug, the

latter having ducts leading from said sec- V0nd inlet, to direct airV from the second'inlet into path of mixed air and gas from the central opening, the plug having an enlarged openingbelow said central duct.

3. The combination with a burner-pipe, of a valve-casing connected to the burner-pipe and provided with a gas jet, avalve in said oaSing for controlling the supply of gas, the pipe being pro-vided with an air-inlet to gas from the j et, and a plug in the pipe having a central duct into which gas from the jet and airv from the inlet will be directed, the

' lburner-pipe being provided with a second inlet around the plug, the latter having airinlet ducts' lea-ding from said inlet toy direct air to the Huid from the central duet, the plug being formed to t in thel pipe below the second inlet. Y

fl. The combination with a burner-pipe, of a valve-casing connected to the burnerpipe and provided with a Vgas-jet, a valveV lburner-pipe being provided with a second inlet around the plugthe latter having airduets leading froin'the second inlet to fluid from the central duct, the plughaving an enlarged outlet through which fluid from the central duet and the duets. from the second; inlet passes, tllie-pluglbeing formed toVV CIK fit the pipe below the seeond'inlet, andn the lower wall ofthercentral duetformingA an annular {lange between thecentral duet and the outlets of the air'duets;

`i'Vitn'ess'es: A

MILDRED STUMPE, Y K ivrHARrNn GERLAGH.

Copies of thi patent may be obtained for ve cents each,V by addressing Vthe Chnimissio'ner of- Patents,-

Washington, D. CJ il Groen T. ROSENGREN. Y Y 

